1 / 10

Solar flare waiting time distribution (WTD)

Solar flare waiting time distribution (WTD). First steps Oscar Olmedo. Outline. Flare waiting distributions What does it model? Power law distribution Sympathetic Flaring. Flares. Boffetta (1999) “Self-Organized Criticality or Turbulence?”

ismael
Download Presentation

Solar flare waiting time distribution (WTD)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Solar flare waiting time distribution (WTD) First steps Oscar Olmedo

  2. Outline • Flare waiting distributions • What does it model? • Power law distribution • Sympathetic Flaring

  3. Flares • Boffetta (1999) “Self-Organized Criticality or Turbulence?” • Lu and Hamilton(1991) Magnetic field evolves in a Self organized critical state so flares are an avalanche process. • Or Flares arises from turbulent process. Turbulence shows time intermittency I.e. dissipative events are not uniform but occur in bursts. • Shell model of MHD turbulence correctly reproduce the power law distribution

  4. Flares • Wheatland (2000)”Origin of the solar flare WTD” • Shows Power law originates from an exponential distribution of flaring rates. These results support the avalanche model.

  5. Distribution • Boffetta (1999) • Power law • Wheatland (2000) • Time between flares follows a time varying Poisson distribution. • Distribution of flaring rates is exponential

  6. WTD (Wheatland) Wheatland (2000) Poisson model for flare waiting times. (Right) Flare rates as calculated with Bayesian blocks

  7. Bayesian blocks • Jeffrey Scargle “Studies in astronomical time series analysis. V. Bayesian blocks, a new method to analyze structure in photon counting data.(1998) Each block represent different Poisson rate

  8. Power Law P=Ax-a a=2.1 Wheatland a=2.16 ±0.05 Boffetta a=2.4±0.1

  9. Sympathetic flaring • Pearce and Harrison (1990) • First to show sympathetic flaring • Moon (2002) • Looked at more events

More Related